When the head is turned upward and forward it will usually be preferable to bring up the hind limb, as, owing to the drooping of the womb into the abdomen, rotation of the fetus will usually be easier in that direction, and if successful the resulting position will be a natural posterior presentation, with the back of the calf turned toward the rump of the cow.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
When labor pains have lasted some time without any signs of the water bags, the dropping in at the sides of the rump, and the other preparations for calving being accomplished, the hand should be introduced to examine.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
I stooped to pick it up, meaning to fling it on to the deck, but its tail broke off at the rump, like a pipe-stem.
"The Frozen Pirate"
W. Clark Russell